JPH0667143A - Liquid crystal type projector - Google Patents

Abstract

PURPOSE:To efficiently cool a liquid crystal display panel without making larger in size and without increasing cost and noise by integrally forming a heat radiation part having radiation fins on a panel mounting base. CONSTITUTION:The panel mounting base 11 consists of a base plate part of a thin plate shape supporting the liquid crystal display panel 7 and a large number of radiation fins 16 bulgingly formed on the base plate and, for example, the whole panel mounting base 11 corresponds to a heat radiation part. At the center of the base plate part, a window is formed and the liquid crystal display panel 7 is incorporated into the window and fixed. The radiation fins 16 are formed on both surfaces of the base plate and respective radiation fins 16 are extendingly formed in the air blowing direction of a blowing fan 12 and formed parallel to each other. The following fan 12 is arranged so that the blowing center 12A is shifted toward a light source 4 from the liquid crystal display panel 7, air flows from an inlet 13 formed on a case body 2 along the liquid crystal display panel 7 and the panel mounting base 11 by the driving of the blowing fan 12 and is discharged from a discharge port 14 at a side wall of the case body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video image display device, and more particularly to a liquid crystal projector.

[0002]

2. Description of the Related Art There are various types of video image display devices, one of which is a liquid crystal projector, which is connected to a video signal receiving / reproducing device such as a video deck, Is used by connecting to a video camera or the like having a playback function. A liquid crystal projector is generally composed of a light source, a reflecting mirror, a condenser lens, a projection lens, and the like. The light flux from the light source is transmitted to the liquid crystal display panel, and further is transmitted through the projection lens to display the liquid crystal. It is a device that projects an image on a display panel onto a screen.

Since a video image on a small area liquid crystal display panel is projected on a large area screen with sufficient illuminance, the liquid crystal projector requires a considerably powerful light source. As such, a high-output incandescent lamp such as a halogen lamp is used. Therefore, in a liquid crystal projector, a strong luminous flux sufficient to obtain sufficient illuminance on a large-area screen passes through a liquid crystal display panel with a relatively small area. The temperature of the panel tends to rise. In order to suppress the temperature rise of the liquid crystal display panel, a heat ray absorbing filter is provided between the light source and the condenser lens, or the liquid crystal display panel is forcibly cooled by an electric fan.

[0004]

However, the reduction of heat rays by the heat ray absorbing filter is not sufficient, and
In the end, either the output of the light source should be suppressed or the cooling capacity of the electric fan should be increased. When the output of the light source is suppressed, the illuminance when projected onto a large screen becomes insufficient, and therefore the performance of the liquid crystal projector is limited. Further, in order to increase the cooling capacity of the electric fan, the fan is increased in size or the number of rotations of the fan is increased, so that the liquid crystal projector itself is increased in size, resulting in an increase in cost and a large noise. There was a problem of occurrence.

In particular, in a liquid crystal projector which can be used by being mounted on a portable video camera, the miniaturization of the device is given the highest priority. However, when the casing of the device is miniaturized, heat is likely to be accumulated and the size is large. The problem was more serious as it became difficult to install the electric fan. The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a liquid crystal projector capable of efficiently cooling a liquid crystal display panel without increasing the size and increasing cost and noise. To provide.

[0006]

To achieve the above object, the present invention provides a liquid crystal display panel, a panel mount for fixing the liquid crystal display panel, and a projection for projecting an image through the liquid crystal display panel. In a liquid crystal projector including a light source for use with a light source, a heat dissipation portion having heat dissipation fins is integrally formed on the panel mount.

Further, according to the present invention, the liquid crystal display panel, the panel mount and the light source are arranged in a housing, and the housing is provided with a blowing means for blowing air to the liquid crystal display panel and the heat radiating portion. Is characterized by. Further, the present invention is
The radiating fins are formed so as to extend along a blowing direction of the blowing unit. Further, the present invention is characterized in that the air blowing center of the air blowing means is arranged closer to the light source side than the heat radiating portion.

[0008]

The panel mounting base not only functions as a means for fixing the liquid crystal display panel but also functions as a heat radiating member. Therefore, the heat generated in the liquid crystal display panel is radiated from the radiating fins of the panel mounting base, and the liquid crystal display The panel is cooled efficiently. When the blower is provided, the heat generated in the liquid crystal display panel is radiated more efficiently from the heat radiation fins. In this case, the cooling efficiency can be further improved by forming the radiating fins so as to extend along the air blowing direction of the air blowing means or by disposing the air blowing center of the air blowing means closer to the light source side than the heat radiating portion. .

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a liquid crystal projector of this embodiment. In FIG. 1, 1 is a liquid crystal projector, 2 is a housing, and the right side in FIG. 1 is the front side on which an image is projected. Case 2
Is formed in the shape of a long box having a rectangular cross section, and in this housing 2, from the rear side to the front side, a reflector plate 3, a light source 4, a heat ray absorption filter 5, a condenser lens 6, a liquid crystal display panel 7, A projection lens 8 for sequentially projecting an image displayed on the liquid crystal display panel 7 onto a screen provided in the front is sequentially arranged. The liquid crystal display panel 7 is a video signal receiving / reproducing device such as a video deck, or It is connected to a video camera equipped with a playback function. The projection lens 8 is supported in a lens barrel 9, and the lens barrel 9 is provided in a support hole provided at the front end of the housing 2 so as to be movable back and forth. It is configured so that they can be matched.

The liquid crystal display panel 7 has a panel mount 11
Is fixed upright in the housing 2. Further, an electric blower fan 12 is provided on the inner surface of the side wall of the housing 2 so as to face the liquid crystal display panel 7. The blower fan 12 is arranged such that the blower center 12A is displaced toward the light source 4 side with respect to the liquid crystal display panel 7, and when the blower fan 12 is driven, as shown by an arrow in FIGS. Flows from the suction port 13 formed on the side wall of the housing 2 along the liquid crystal display panel 7 and the panel mount 11, and is discharged from the exhaust port 14 on the side wall of the housing 2.

FIG. 2 is a plan view of the panel mount, FIG. 3 is a front view thereof, and FIG. 4 is a side view thereof. The panel mount 11 is composed of a thin plate-shaped substrate portion 15 that supports the liquid crystal display panel 7, and a large number of heat radiation fins 16 that are bulged and formed on the substrate portion 15. Corresponds to the heat dissipation part. A window 17 is formed in the center of the substrate portion 15, and the liquid crystal display panel 7 is incorporated and fixed in the window 17. The radiating fins 16 are formed on both surfaces of the substrate portion 15, and the radiating fins 16 are formed so as to extend in a direction along the blowing direction of the blowing fan 12 and are parallel to each other.

Since this embodiment is constructed as described above, even if the light source 4 is affected by heat during projection, this heat is efficiently radiated from the heat radiation fins 16 of the panel mount 11, so that the liquid crystal The display panel 7 is cooled efficiently. Therefore, with a simple structure using the panel mount 11,
The liquid crystal display panel 7 can be cooled efficiently.

In the embodiment, a blower fan 12 is provided,
Since the blower fan 12 forcibly cools the liquid crystal display panel 7 and the panel mount 11 by air, the cooling efficiency of the liquid crystal display panel 7 can be further enhanced. Therefore,
It is possible to efficiently cool the liquid crystal display panel 7 without increasing the size of the blower fan 12 or increasing the rotation speed, and it is also possible to increase the light amount of the light source 4 without causing any inconvenience to the liquid crystal display panel 7. . Further, since the heat radiation fins 16 are formed so as to extend along the blowing direction of the blower fan 12, the liquid crystal display panel 7 and the heat radiation fins 16 are formed.
Cooling air flows in a regular manner along the liquid crystal display panel 7
The cooling efficiency of can be further improved. Further, since the blower fan 12 is arranged so as to be shifted closer to the light source 4 side than the portion facing the side of the panel mount 11, the surface of the liquid crystal display panel 7 on the light source 4 side, which is easily affected by heat from the light source 4, is efficient. It is well cooled, and the cooling efficiency of the liquid crystal display panel 7 can be further enhanced.

[0014]

As described above, according to the present invention, since the liquid crystal display panel is cooled by using the panel mount, the size is not increased, and the cost and noise are not increased. The liquid crystal display panel can be efficiently cooled, and the light amount of the light source can be increased. In addition, an air blower is provided, a radiation fin is formed to extend along the air blow direction by the air blower, or the air blow center of the air blower is
If it is arranged closer to the light source side than the heat dissipation portion, the cooling efficiency of the liquid crystal display panel can be further enhanced.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a liquid crystal projector according to an embodiment of the present invention.

FIG. 2 is a plan view of a panel mount.

FIG. 3 is a front view of a panel mount.

FIG. 4 is a side view of a panel mount.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal projector 2 Housing 3 Reflector 4 Light source 7 Liquid crystal display panel 11 Panel mounting base 12 Blower fan 15 Board part 16 Radiating fin

Claims (4)

[Claims] 1. A liquid crystal projector comprising a liquid crystal display panel, a panel mount for fixing the liquid crystal display panel, and a projection light source that projects an image through the liquid crystal display panel. A liquid crystal projector characterized in that a heat dissipation portion having heat dissipation fins is integrally formed on the mounting base. 2. The liquid crystal display panel, the panel mounting base, and the light source are arranged in a housing, and the housing is provided with a blowing unit for blowing air to the liquid crystal display panel and the heat radiating portion. Liquid crystal projector. 3. The liquid crystal projector according to claim 2, wherein the radiating fins are formed so as to extend along a blowing direction of the blowing unit. 4. The liquid crystal projector according to claim 2, wherein the air blowing center of the air blowing unit is arranged closer to the light source side than the heat radiating portion.